Line-height issue in WYSIWYG "Heading 2" (h2) formatting: lines overlap

Line-height issue in WYSIWYG text Format, specifically "Heading 2" (h2): if text is more than one line, it overlaps, and so far it doesn't respond to me attempting to add some inline styling to fix it. Not including link because I'm not leaving the problematic formatting on my page, but including screenshot.
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